1. Shell Programming and Scripting

Hi, I am using bash shell's extended pattern matching. What tweak the following code needs in order to get the expected output? shopt -s extglob f="a@b@_c@d@_e" echo "${f/@(@|@_)/__}" My expected output is: a__b__c__d__e but the actual output is: a__b@_c@d@_e # that is, how to... (3 Replies)

2. Shell Programming and Scripting

I have a script that start out with this: #!/sbin/sh Several things run. However I cannot get: shopt -s nullglob to run in Bourne. I get: shopt: not found So within the main script (after #!/sbin/sh at the top) I start bash with: bash and try to run what I need with: shopt -s... (2 Replies)

3. UNIX for Advanced & Expert Users

What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file. # When the shell exits, append to the history file instead of overwriting it shopt -s histappend (3 Replies)